LocoMP

This is a beta

LocoMP brings multiplayer to Derail Valley. One of you hosts their world, the rest join in - same trains, same jobs, same money troubles. Built from scratch, open source under the MIT licence.

It holds up well in our sessions - and a dedicated server has survived a 24 hour soak - but it is early, and features may be missing or broken. Some definitely are. Your singleplayer save is protected by design (see Joining below), but treat every session as a playtest, because that is what it is. Bug reports genuinely shape what gets fixed next; there is a section on that further down.

LocoMP is an independent fan project, not affiliated with or endorsed by Altfuture s.r.l. Parts of it are developed with AI assistance under human direction and review.

What works today

• []Multiplayer • Shared world - one player hosts from their loaded save; everyone else joins over a direct connection. Built for friend-group sessions first; bigger lobbies are a roadmap item. [/]

  []Train sync without snap-back - coupling, uncoupling, derailing and rerailing are all committed by the host, so consists never rubber-band apart. Junctions and turntables sync too. [/]

  [] Multi-crew - hop into a mate's cab and take the controls. Everyone sees the same levers move. [/]

  []The fiddly hardware as well - brake hoses, anglecocks, MU cables and handbrakes sync, and so does the time of day, so you are all squinting into the same sunset.[/]

Careers and economy

• []Per-player careers by default - your own wallet, your own licenses, your own progress, saved on the host and restored when you come back. Prefer classic co-op? Host with Shared Career and run 1 wallet between you. [/]

  []Real jobs, real pay - joined players claim jobs from the host's board; delivery is validated by the game itself and bonuses pay out the same as singleplayer. [/]

  []Honest fees - license costs, delete and rerail charges all land on the right wallet, and refusals tell you why.[/]

• []Inventory and shop sync - what you buy, carry and drop is tracked per player and survives reconnects.[/]

[]Reconnect grace - drop out and your claims and progress are held for 10 minutes; rejoin and carry on where you were. [/]

[]A proper in-game UI - a MULTIPLAYER entry in the menu with Direct Join, Host and Settings screens, a staged loading checklist, in-game chat, and a clean Leave button when it is time to go. [/]

[*]Host tools - live player list with ping, kick and ban, promote a mate to admin, change the password or player cap mid-session, pause new joins, save on demand, restore from rota