Tank Passenger Train Set #20 from 1934-40. Well, not quite since the 'full set' had two passenger coaches and the Guard's Van; but it's all I've got thus far. Part of the casting has flaked off the Passenger Coach but it is still a treasured part of my collection.
The earlier #17 Passenger Train Set had a Locomotive and Tender, with this single Coach and Guard's Van. In the #20 Set, the Tender was replaced by a second Coach and the Locomotive was the Tank Engine from the Goods Train Set.