The access road to the four track depot is still apparently active and the depot signposted as MPRS, which apparently stands for Multi-Path Railway System.
The depot is located here:
https://maps.app.goo.gl/FF1ED1XwWZehRuBH9 and the system can clearly be followed on the satellite images.
You can see the MPRS from the Lulworth Range Walks on the hills above with binoculars (or even better a bird watching telescope) about 875 metres away at the nearest point, but these walks won't be open when it is in operation!
The ranges also have rail mounted targets that move up and down a single self-contained track, including one about 250m long enclosed within a loop of the MPRS itself. Others are close to the range walks in various places across the ranges near Tyneham and Worbarrow Bay including here:
https://maps.app.goo.gl/yTNdTJxkHEBf3qBw6 close to the path from Tyneham Car Park to the beach.
While online details are scant, there is a facebook post from 2018 which describes how a power failure on the Lulworth MPRS was rectified here:
https://www.facebook.com/Landmarc.S...ry-school-in-dorset-in-the-/1218824864919053/
Great collaboration by our team at the Lulworth Gunnery School in Dorset in the South West! The site suffered a significant power outage, which impacted the whole gunnery range, the Multi-Path Railway System (MPRS) and parts of the camp itself.
Swift action from the Landmarc team meant that power was restored quickly for the soldiers on the range and in the camp but unfortunately the MPRS still remained without power.
It gets a mention in a Defence Safety Authority online document from 2020 about ranges in general (on pages 270 and 271 of 323):
https://assets.publishing.service.g...Part_3_Volume_2__June_20__Updated_Page_22.pdf
Multi Path Railway Sysytem (sic) (MPRS). The MPRS at Lulworth is a unique target railway system based on a tube train system. Maintenance and operation is provided by the DIO Industry partner and governed by the rules set out in JSP 790.
I holiday close by regularly and would definitely be up for a Branch Line Society railtour of the system, but I won't be holding my breath...