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The railbus is a small mod with a single wagon. It is an electric railbus or tram in typical red and grey German colurs. It is a bidirectional vehicle with doors and driving controls at both ends and seats in the middle. Some of the normals seem wrong on the front of the vehicle (presumably the back was copied to the front but Blender often flips normals in this kind of operation..).
The railbus is meant to be recoverable (drop itself), however the drop is broken. Until/unless this is fixed in mbb's version, it is recommended you use Blockhead's fork.