Games like Railroads Online
Games like Railroads Online include Garry's Mod, BeamNG.drive, Car Mechanic Simulator 2018, Forza Horizon 5, and Brick Rigs. We matched them by the tags players give Railroads Online on Steam (Trains, Multiplayer, Online Co-Op, Open World, and Building): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Multiplayer · Sandbox · Building

BeamNG.drive
Shared: Physics · Driving · Automobile Sim

Car Mechanic Simulator 2018
Shared: Multiplayer · Automobile Sim · Building

Forza Horizon 5
Shared: Multiplayer · Open World · Automobile Sim

Brick Rigs
Shared: Multiplayer · Building · Open World

Euro Truck Simulator 2
Shared: Open World · Automobile Sim · Driving

My Summer Car
Shared: Open World · Automobile Sim · Building

MudRunner
Shared: Multiplayer · Automobile Sim · Open World

American Truck Simulator
Shared: Open World · Automobile Sim · Driving

SnowRunner
Shared: Multiplayer · Automobile Sim · Open World

Forza Horizon 6
Shared: Multiplayer · Open World · Automobile Sim

Scrap Mechanic
Shared: Multiplayer · Building · Open World

Construction Simulator
Shared: Multiplayer · Online Co-Op · Building

Valheim
Shared: Online Co-Op · Multiplayer · Open World

Space Engineers
Shared: Building · Sandbox · Open World

RoadCraft
Shared: Building · Online Co-Op · Multiplayer

Raft
Shared: Multiplayer · Open World · Building

Stormworks: Build and Rescue
Shared: Open World · Building · Sandbox

Terraria
Shared: Multiplayer · Sandbox · Building

Rust
Shared: Multiplayer · Open World · Building

Grand Theft Auto V Legacy
Shared: Multiplayer · Open World · Automobile Sim

The Crew™ 2
Shared: Multiplayer · Open World · Automobile Sim

7 Days to Die
Shared: Multiplayer · Open World · Online Co-Op

Assetto Corsa
Shared: Multiplayer · Automobile Sim · Open World