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The OBA, OCA, & SPA wagons followed the OAA wagons, to form the largest part of the air braked open wagon fleet. They have similar underframes and suspension. There were 1600 SPA wagons, a large number of which were transferred to the engineers' fleet (ZAA - PIKE). This was also the case with the OBA & OCA, as about half the 800 OBAs and some of the OCAs were coded ZDA - BASS.
However, after being taken over by EWS, most if not all of these wagons returned to revenue stock, although they were still used for engineering work. Some OBA wagons were rebuilt as "Sea Urchin" wagons and 30 OCA wagons had new fixed sides as "Seahorse" - see the Departmental page for kits.
The kits have pivotting wheel/axleguard units which are turned by the couplings, and returned to a straight position by a tension spring.


BR OBA Wagon

C17 OBA 31tonne WOOD BODIED OPEN WAGON (1977-9)

The kit has the body style of the second half of the build, with unequal spacing of door hinges and straps, plus square door "buffers" rather than round. The Bachmann RTR version has the earlier type of body, although the numbers applied to these do not necessarily take this into account.

BR bass Wagon


C18 OCA 31tonne STEEL BODIED OPEN WAGON (1981-2)

These followed on from the OBAs with a steel body, but retained the wood floor and "turn-over" bolsters of the OBA.(A number of the floor planks could be tipped sideways onto the adjacent plank to support the load clear of the floor and allow loading by forklift. Some OCAs were converted into Sea Horse wagons (C16 kit details…) and OTA (see below).

BR OCA Wagon


C19 SPA 31.5tonne STEEL PLATE WAGON (1980)

BR SPA Wagon


These have a distinctive chequer-plate floor and wooden cross battens. The solebar is shallower without the cut outs found on the OBA & OCA. The lower picture shows a ZDA Pike in the "Dutch" livery — later on some of the Pikes had the doors welded shut and became "Seahares". Two SPAs also featured in a rather odd conversion of a BPA into the prototype BMA. More…
Some had a row of stanchions down the centre and a locker at one end. Others were fitted with a blue pvc hood. A number of wagons were were converted to "Sea Urchin" ( C41 kit details… ) wagons with fixed sides for ballast and spoil.


Timber wagon conversions:

125 of the OCA wagons were converted in 1985 to OTA timber wagons. They were used to carry softwood to paper mills. Seen mainly in the South West, Wales, the North & Scotland. The number of locations served was reduced after the end of the Speedlink service. All were out of use by the end of 2007, and a number had previously been written off in a serious derailment in 2002 at Quintinshill (which has previous "form" –1915) caused by a failed bearing. Accident report


C20 OTA-A 46tonne GLW TIMBER WAGON (1985)

OTA-A Wagon

OTA-As had either 11 or 13 stanchion sockets; either of which can be made from the kit.
More recently some of the stanchions & sockets have been removed leaving only 8 on each side.
Includes a capping strip for making the flat-topped-end version, as shown below.

OTA-A flat ended Wagon


C21 OTA-C 46tonne GLW TIMBER WAGON (1985)

BR OTA-C Wagon

This type had 9 stanchions. There were 25, originally leased to Thames Board to take timber to their Workington Mill, but when this traffic ended, they went back into the pool of OTAs. Some retained their blue livery for some years afterwards.


C112 15ton TIMBER WAGON (1962-63)

BR 15 ton timber Wagon

80 wagons were built in 1962-63 to Diagram 1/420 and used to transport imported timber from east coast ports such as Lowestoft, Boston and Wisbech. A few had the side stanchions reduced in height and were used to carry baled paper from Portishead to a paper mill in Bristol. When the timber traffic ceased, the wagons were used as runners, some having their end cut off and laid flat on the floor (enabling their used under overhanging loads).
It may be possible to design the kit so that the very similar BSCO steel carrying wagon could be modelled.