Seems to be a lot more Tanks in use on these trains that I remember previously, is no sandite used?
There's usually been a mix of RHTT formations in previous years, some with sandite and some without (water jetting only). I'm not sure what determines whether jetting only or jetting + sandite is preferred on any given circuit, or if anything has changed recently.
Browsing some photos suggests there are three typical configurations of the RHTT modules (3 modules per wagon),
1) sandite - pump - tank - tank - tank - sandite
https://www.flickr.com/photos/dbs60100/22012344510/ (Photo: DBS 60100)
I think the reason for having sandite modules at each end is so that the sandite can be applied after jetting, regardless of direction of travel (otherwise the sandite could be blasted off by the jets).
2) tank - pump - tank - tank - tank - tank
https://www.flickr.com/photos/se_rail/37434355134/ (Photo: South-East Rail)
3) as per the first configuration (with sandite) but with an extra wagon in the centre conveying 3 additional water tanks
https://www.flickr.com/photos/32865578@N02/50552549397/ (Photo: John Eyres)
Close-up of pump module:
https://www.flickr.com/photos/darlo2009/8071715529/ (Photo: MK Darlo)
Close-up of sandite module:
https://www.flickr.com/photos/munzer/42513050995/ (Photo: Chloe Munzer)
Close-up of water tank module:
https://www.flickr.com/photos/darlo2009/8071710290/ (Photo: MK Darlo)
***
Update on current RHTT wagon locations:
* indicates a change of location since
post #151 on 15th September. Presumably most of the wagons at Whitemoor will end up based at Stowmarket?
613101 Coleham*
613102 Port Talbot*
613103 Port Talbot*
613104 Swindon
613105 Coleham*
613106 Swindon
613107 Swindon
613108 Swindon
613109 Swindon
613110 Coleham*
613111 Coleham*
613112 Swindon
642001 Inverness*
642002 Inverness*
642003 York
642004 Kings Norton*
642005 Inverness*
642006 Carlisle
642007 Whitemoor
642008 Carlisle
642009 York
642010 Kings Norton*
642011 Whitemoor
642012 Peterborough*
642013 Kings Norton
642014 Whitemoor*
642015 Inverness*
642016 Whitemoor*
642017 Inverness*
642018 York
642019 Whitemoor
642020 York
642021 York
642022 Carlisle
642023 Carstairs
642024 Whitemoor
642025 Swindon
642026 Carstairs
642027 Whitemoor*
642028 York
642029 Peterborough*
642030 Peterborough*
642031 Taunton*
642032 Peterborough*
642033 Whitemoor*
642034 Carlisle
642035 Taunton*
642036 Peterborough
642037 Carlisle
642038 Kings Norton
642039 Whitemoor*
642040 Kings Norton
642041 Whitemoor
642042 Whitemoor
642043 Whitemoor
642044 Whitemoor
642045 Whitemoor*
642046 Swindon
642047 Whitemoor
642048 Whitemoor
642049 Kings Norton
642050 Peterborough
7093100011 Tonbridge
7093100029 Tonbridge
7093100037 Tonbridge
7093100045 Tonbridge
7093100052 Tonbridge
7093100060 Tonbridge
7093100078 Tonbridge
7093100086 Tonbridge
7093100094 Tonbridge
7093100102 Tonbridge
7093100110 Tonbridge
7093100128 Tonbridge