Mark 4
As with Mark 3A vehicles, Mark 4 Open Standards carry the TSO designation. Further sub divisions exist: TSOE Open Standard (End) and TSOD Open Standard (Disabled Access). The TSOE vehicles are specifically designed to be adjacent to the train locomotive and were built with a single corridor connection at one end only. The other end of the coach has no corridor connection, just a small window, although the structural arrangements to allow a corridor connection to be added if required at a later date are present. Mark 4 TSO vehicles are numbered in the 12200-12232 (TSOE), 12300-12331 (TSOD) and 12400-12538 (TSO) ranges.
Read more about this topic: Tourist Standard Open
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