Traction maintenance depot

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A traction maintenance depot, or TMD, is a railway depot where locomotives are serviced and maintained.

A traction and rolling stock maintenance depot, or T&RSMD, is a maintenance depot where multiple units or locomotives and rolling stock are serviced and maintained.

Each rail locomotive in the UK is allocated to a depot. Traditionally, locomotives would have normally been maintained at the depot to which they were allocated.

Today, this is still the same for some train operating companies (TOCs). However, other train operataing companies (such as Freightliner) have general codes with no specific location, whilst others (such as Southeastern) allocate entire class of trains to specific depots, but maintain their trains at any depots, including those which have no trains allocated to them.