Rail Platoon are a group of characters who appear in Metal Shadow Prelude. They are an Agency platoon led by Agent Rail. Its first and main sub-commander is Agent Ex. Agent Delta frequently teams up with Rail and Ex on covert missions. The platoon was been selected exclusively as director Niccoli's personal guard.

Rail Platoon's unnamed members separated from their leader and first sub-commander during the Prelude, and it is said Van killed all of them, taking the jewel of one "Agent Shadow" to form his disguise for an infiltration of Agency HQ.