Not enough NAC DDs, most used for JIS. Most of the LO2x did
Split shift. There were Scanias (like 3658J (did crossover to
238*), 3720L (later did the crossover duty done by 3658J), there
were 2 a/c buses until cut in fleet) and a few NACs did full
day.
Most of the current Sv90 Scanias were still with TPY feeders, many
of the TPY feeder NAC Scanias progressively went to 107 when the
feeder fleet became AC before some came back and do 90).
237 and 238 were I think the last TPY feeder services to have NAC
Scanias, the others had 31L to 37X together with the CAC
Scanias.
*There are no more crossovers from 90 to 238 now, 90's AM crossover
is replaced by 155 (36Z/37X, now 291C). The other crossovers are
the 26 AM (266B), 26 PM (512R) and 155 PM (41H, later 42E, now
481X). it is unsure whether the PM 155 is a new one or replaced a
90 PM crossover, if there was any.