"Thames River Services" is a river boat company which provides sightseeing cruises on the River Thames in London, United Kingdom. TRS cruises operate on the Thames under licence from London River Services, part of Transport for London.
It is owned by three companies Crown River Cruises, Viscount Cruises and Westminster Party Boats 
Scheduled services depart daily from Westminster Pier and travel east along the Thames to Greenwich Pier before returning. In the summer, the boats also circle around the Thames Flood Barrier before stopping at Greenwich. Westbound trips also call at St Katherine's Pier, next to Tower Bridge. Passengers who hold a Transport for London Travelcard and Oystercard are offered a 33% discount on ticket prices.