Can routes be built collaboratively?
The short answer is Yes. Exactly how is another matter. Trainz is the most suitable for modular construction since it is built on standard baseboards. These baseboards can be inserted, copied, or removed. We have found, though, that once the signaling system has been set across baseboards, inserting or deleting a baseboard can cause the signals to malfunction.   An approach especially suited to Trainz is to think of the route as a collection of railroad interchanges, with each person building an interchange. Anyone could then assemble the collection in any arrangement desired, filling in with connecting baseboards.   BVE can be built in modules, with the understanding that BVE is built linearly. There is no opportunity to branch, unless the branched version is treated as a second route.   All sims can be built serially. That is, first one person performs a special function, say setting the contours and laying the track, another person textures the landscape, and another pla