Now come on.
Putting shadows in is just showing off!
Seriously though, the JLTRT wagons do need these. I'm doing a batch of 5 Presflos and I am seriously unimpressed with the underframe and white-metal castings in general. The castings, including the W irons, axleboxes, keepers and brakegear is lumpy, too thick and poorly cast. It's a fight, and a slow one at that, to get the best out of the underframes. Which is a pity as the plastic hoppers and main chassis (solebars, buffer beams etc.) are fantastic - accurate, sharp and a huge time-saving.
I shall take them with me on holiday and post some pics when I get back - if they haven't been hurled off the nearest cliff.
Richard