Platform Length Calculator

This calculator sizes a station platform around the physical train it needs to serve. It sums the train's total length — number of passenger cars times car length, plus any locomotives times their length — and then adds stopping-tolerance distance on both ends to account for real-world variation in exactly where the train stops, since crews rarely hit the same mark to the foot every time. That combined figure is the required platform length, also converted to meters. From there it derives several planning figures: a recommended platform width that steps up from 15 ft to 20 ft once the train exceeds six cars (longer trains draw more passengers waiting simultaneously), a minimum ADA-accessible boarding zone count of at least one per four cars (never fewer than two), and passenger capacity estimates at both a comfortable planning density (10 sq ft per person) and a crush-load standing density (5 sq ft per person), applied against only 60% of the platform's raw area to account for stairs, furniture, and edge clearance that isn't usable standing room.

Canopy coverage is estimated at 70% of platform length, a widely used design convention rather than a code requirement, and Tactile Strip Sections counts the detectable warning strip runs along that edge at one per 20 ft of platform length, so it scales with the platform the way the other length-derived figures do. Clear Envelope Width is the one figure here that is a fixed reference dimension rather than a result: it is a 5 ft platform-edge setback from track centerline (the high-level-platform convention), doubled because an island platform has track on both sides, and it does not move with anything you enter — a side platform is 5 ft, low-level platforms typically use 4.5 ft, and the operating agency's own clearance diagram governs either way. Keep in mind these are all preliminary sizing estimates for early planning — final platform dimensions should always be checked against the specific agency's design standards and the exact rolling stock being procured, since car lengths and door configurations vary by fleet.