London Underground (TFL) contacted Nicol & Andrew due to suffering severe wear to a large number of their train coupling slide boxes. They were faced with having to cut them out and weld in new ones at great cost and downtime.
After carrying out a detailed engineering survey Nicol & Andrew were able to propose an In-situ machining solution to repair the damage without that major surgery.
We designed and built a bespoke long-reachmilling machine which mounts onto the end face of the train enabling a machining head to traverse the full length of the worn coupling slide box.
The worn areas were machined back to a flat parallel condition and precision plates were fitted to restore the components back to original OEM dimensions.
This was performed in 4 days start to finish with minor disruption to the trains schedule.
The repaired coupling slide boxes were tested by London Underground and proven to be back to full operational condition.