Work out train formation length instantly with clear inputs, formula shown and shareable results.
Formation length is locomotive length plus wagons times length over couplers. It matters because passing loops, reception sidings and platforms have fixed lengths, and a train even slightly too long cannot be crossed or berthed, forcing splitting or a longer routing.
Train length
L = loco length + wagons x length over couplers; wagons that fit = (available - loco) / wagon length
Rail results are planning estimates only. Verify against the infrastructure manager's rule book, approved braking curves and applicable railway safety regulations.
It is the actual space each wagon occupies in a formation, including the coupling gear, which is what the loop must accommodate.
Yes. Signal overlaps, stopping accuracy and shunt clearances mean a practical margin of 10-20 m is normally planned.