... use of timbers extending across the full width of a tandem formation. So, if anyone out there can provide me with any information about how the NBR went about timbering a tandem, it would be much appreciated. John, It's not NB but Caley and it's not a tandem, but here's a picture of a three way at Crow Road station on Glasgow showing that sleepers were used throughout. I think that there were some detail variations on NB and Caledonian practices but I'm sure that they all followed the same general rules. 25_100450_140000000.jpg A lot of pre-Grouping interlaced turnouts survived well into the BR period in Scotland- this picture was taken in 1953 and the turnout would probably have survived until the line was closed in the 1960s. I've got another picture somewhere of interlaced turnouts taken in the early 1980s in Scotland which showed that the timbers and the chairs had obviously been replaced at some time in its history in the LMS or BR period so Scottish PWay crews were still carrying out full maintenance on them. Jim. EDIT- Just having a close ...