TPS Grids

I've got bits of Hurst Models ones Superglued to my fingers, table, floor, wall...!

I've not seen Hurst's ones, and I was in no way trying to disparage what appears to be a very nice model, just highlighting the fact that due to the obvious lack of research they have given themselves much more work and higher tooling costs. The loops always come in pairs, either sited with their edges touching to make a TSS or at a distance apart to be an OSS, either way a pack of two single loops is the prototypical way to go, only 1 etch or cast is needed, not the two they have done.

You've not seen the 'half length' pair at Willesden low level. I think they're the TSS for the signal protecting the exit to the bay but the lack of room and 4th rail means a distinctly non standard installation. Although they could also be (still half length) the OSS for the buffers !

Do you mean the miniature loops used as OSS for buffer stops? They had to use smaller loops in terminus platforms because the normal ones suffered from signal reflections from the platform sides, effectively making them more sensitive, to the point where a 10mph limit over them was tripped at

These buffer stop OSS loops are not just half length, they are reduced in width too, and quite often use the same mounting brackets as the full sized versions. Ones at Victoria and London Bridge are noticeably tiny!

Djo