Up Boat train showing fascinating trackwork with catch points and a wagon turntable.

To quote from BRILL "Apart from the nice example of a SR point lock on the Up main line this illustration shows another rare bit of trackwork immediately to the right of the loco chimney opposite the coal yard. Termed a ‘Barry Slip’ due to the extensive use in sorting sidings at Barry Docks they are in fact two turnouts of the same hand, reversed and overlapped. Here they are seen additionally slightly curved. At first glance they look like a double slip but limit the route selection considerably, here they are used to protect the main line from stray wagons in the outer siding forming a trap. Unfortunately an additional trap point is needed for the other sidings and this is sited in the middle of a diamond crossing making sort of a half single slip. The advantage of a ‘Barry Slip’ over a double slip is they are cheap to construct and maintain and can be curved to suit a restricted space site as seen here. More distant in the down side yard can be seen another relatively rare piece of P. Way, a wagon turntable, feeding a siding at 90 degrees to the main line on the headshunt to the platform loop. Looking at old plans it used to feed 3 sidings, but now has been cut back to one, however there was always the danger of a wagon being shunted onto the turntable over-running the table and fouling the main line. It would be interesting to see what mechanical interlocking was in place to restrict such conflicting moves.
For those interested in such mundane things as Bulleid Pacifics 34097 Holsworthy is at Paddock Wood in June 1952 with an Up boat train. It would be rebuilt in March 1961 after completing just over 500,000 miles and continue in service until April 1967, being cut up at J.Cashmore’s of Newport in September of the following year".