Which Train Side evaluates the geography along a railway to estimate which side of the train offers the stronger view for a particular journey. The result is based on the actual rail alignment, direction of travel, nearby mapped scenery, and the position of those features relative to the train.
The system is designed to answer a practical question: when traveling between two stations, is the scenery generally stronger on the left, on the right, or reasonably balanced between both sides?
Scenery and sun exposure are calculated separately because the side with the better landscape is not necessarily the side with less direct sunlight.
Following the Actual Railway
The calculation begins with the physical path of the railway between the selected stations.
A straight line between the origin and destination would not provide a useful answer. Railway lines curve around mountains, follow rivers, cross valleys, approach cities from different directions, and sometimes change orientation repeatedly within a relatively short distance.
For this reason, the route geometry is divided into sections that preserve the direction in which the train travels. These sections provide the reference needed to determine whether a geographic feature lies to the left, right, or effectively on both sides of the train.
Finding Scenery Near the Track
Mapped geographic features within a relevant distance of the railway are evaluated as potential scenery.
Depending on the area, these can include:
- lakes and reservoirs,
- rivers and canals,
- coastlines and bays,
- mountain peaks and ridges,
- valleys and cliffs,
- beaches,
- viewpoints and attractions,
- castles, forts, ruins, monuments, memorials, and archaeological sites.
A feature does not automatically receive the same importance simply because it is present near the route. Its type, distance from the railway, position relative to the track, and the amount of scenery around that section all contribute to the result.
Determining Left and Right
Left and right are calculated from the perspective of a passenger facing the train’s direction of travel.
For each relevant feature, its position is compared with the direction of the railway at the nearest appropriate point. This determines whether the feature lies primarily to the left or right of the moving train.
Some features are too close to the railway, too broad, or positioned in a way that makes a single-side classification misleading. These can be treated as both-side scenery.
The direction matters. If the same railway section is traveled in reverse, a feature that was previously on the left will normally appear on the right. Which Train Side reverses the side relationship when the direction of travel changes.
How Scenery Is Weighted
The final recommendation is not based on simply counting how many mapped objects appear on each side.
A large river running beside the railway for a substantial distance should have more influence than a small isolated feature far from the track. Likewise, a concentration of relevant scenery can be more meaningful than a single mapped point.
The scoring process considers factors such as:
- feature type and its likely relevance to the view,
- distance from the railway, with closer features generally carrying more weight,
- side of the track relative to the direction of travel,
- distribution of scenery across the route,
- named features, which can provide stronger geographic context than unidentified mapped objects.
Multiple map objects that represent the same named place may be combined so that a river, lake, or other feature split into several mapping segments does not gain artificial weight simply because of the way it is stored in the source data.
Overall Side Recommendation
After the scenery evidence has been evaluated, the accumulated left-side and right-side signals are compared.
The result is expressed as one of three main outcomes:
- LEFT when the available scenery evidence clearly favors the left side,
- RIGHT when it clearly favors the right side,
- BOTH when the scenery is sufficiently balanced or when worthwhile views occur on both sides.
A route is not forced into a left-or-right answer when the available evidence does not support a meaningful preference.
Confidence
Confidence indicates how clearly the available route evidence favors the displayed result.
A strong concentration of scenery on one side with relatively little competing scenery on the opposite side can produce a higher confidence result. A route with similar scenery scores on both sides will naturally produce a lower directional advantage or a BOTH result.
Confidence should not be interpreted as a percentage chance that every passenger will see a particular landmark. It reflects the strength of the geographic evidence used to compare the two sides of the route.
Named Scenic Places
Where reliable names are available, route pages can display individual scenic places found near the railway.
Named features are useful because they allow travelers to understand what is contributing to a recommendation rather than seeing only a left-or-right result.
Unnamed geographic features may still contribute to the overall calculation. They are generally not presented as named scenic places because doing so would provide little useful information to a traveler.
Sun Position and Exposure
Sun exposure uses a separate calculation from the scenery recommendation.
For a selected date and time, the sun’s position is calculated from the geographic location of the route. The calculation considers the sun’s azimuth, its elevation above the horizon, and the direction in which the train is traveling.
This allows the system to estimate whether direct sunlight is primarily coming from the left, right, front, or rear of the train at a particular point along the route.
When the sun is below the horizon, the route is treated as having no direct solar exposure for that calculation.
Because both the railway direction and the sun’s position change over time, exposure can change during the same journey. A side that is shaded during one section may receive direct sun later in the trip.
What the Sun Map Shows
The Sun view on the route map provides a visual representation of the direction from which sunlight is expected to reach the railway at the selected time.
It is intended to help travelers compare sun exposure with scenery preference. For example, the side with the stronger landscape may also be the side receiving direct afternoon sun.
The sun calculation describes outdoor solar direction. It does not account for every temporary source of shade, such as buildings, tunnels, dense vegetation, terrain blocking the horizon, station canopies, or the design of an individual railcar.
Route Direction and Reverse Journeys
The same physical railway corridor can be traveled in either direction without creating two unrelated geographic analyses.
When the journey is reversed, the underlying scenery remains in the same place, but the passenger’s left and right sides change. The scenery relationship is therefore reversed automatically.
Sun exposure is recalculated rather than simply flipped because it depends on the selected time, date, location, and direction of travel.
Data Updates
Railway geometry and mapped scenery can change over time. Track alignments may be updated, stations may change, new geographic features may be mapped, and existing map information may be corrected.
Scenery results are tied to the route geometry used during analysis. When the underlying railway geometry changes materially, the previous scenery result is not treated as current for the new alignment until that section has been processed again.
This helps prevent an older left-or-right result from being applied to a route whose physical geometry has changed.
What the Method Does Not Measure
The calculation focuses on geographic position and mapped scenery. Some factors that influence the real-world view are outside that scope.
These can include:
- window size and placement,
- seat orientation,
- double-track or multi-track operating position,
- temporary rolling stock changes,
- trees and seasonal vegetation,
- weather and visibility,
- construction or temporary obstructions,
- terrain that blocks a distant mapped feature,
- tunnels and covered sections,
- operational diversions from the usual route.
For this reason, the recommendation is best understood as a comparison of the geographic scenery potential on each side of the railway, rather than a prediction of the exact view from a specific seat on a specific train.
Why Some Routes Are More Decisive Than Others
Some railways naturally produce a strong result. A route following a coastline, major river, mountain range, or broad valley may keep important scenery on one side for long sections of the journey.
Other routes cross varied terrain or change direction frequently. In those cases, good views may alternate between sides, making BOTH a more accurate result.
The methodology is intended to preserve that difference instead of producing a left-or-right recommendation for every journey regardless of the underlying geography.