Soho TMD is a railway traction maintenance depot situated in Smethwick, West Midlands, England.

It is located in Smethwick's industrial area of Soho on the boundary with Birmingham, its depot code is SO.

The depot is approximately 2 mi (3.2 km) west of Birmingham New Street station.

Soho was purpose built as a depot for maintaining the former West Midlands based Class 323 EMU fleet.

It is the home depot for WMT's Class 730/0 EMU fleet, where most maintenance of the units takes place, it is also used to stable Class 350 EMUs.