Gorton Jct to Guide Bridge masts question

[Trackman]

There's a (long) bridge inbetween Gorton and Guide Bridge, it's only shortish but there are about 40 separate masts inside the bridge.
What's going on?
I have my own theory, just seeing if I can find the definitive answer.
The video is from RUKF's @Don Coffey You Tube channel.

 

[Halish Railway]

I’m assuming that this is in reference to the Mk3 design of single wire registration arms underneath the M60 overbridge, which I believe opened for Motorway traffic in 1998.

I think it was just the easiest way of lowering the wire height of electrification erected in the 1940s/1950s. The registration arms are connected to masts, rather than being suspended from the overbridge to allow the railway to remain operational whilst the Motorway was being constructed.

 

[59CosG95]

I’m assuming that this is in reference to the Mk3 design of single wire registration arms underneath the M60 overbridge, which I believe opened for Motorway traffic in 1998.

I think it was just the easiest way of lowering the wire height of electrification erected in the 1940s/1950s. The registration arms are connected to masts, rather than being suspended from the overbridge to allow the railway to remain operational whilst the Motorway was being constructed.

Also removes the need for disruptive inspections of the bridge from below; if arms were to be installed the traditional way there'd have to be stovepipes installed, tests to make sure the stovepipes wouldn't come loose etc.

 

[edwin_m]

The large number of structures is presumably because the clearance is limited so they need to be close together to minimise the wire uplift between them. Normally new bridges on motorways etc provide generous clearances, so I assume there was some reason why they couldn't have made the M60 a bit higher to avoid having to do all this.

 

[59CosG95]

The large number of structures is presumably because the clearance is limited so they need to be close together to minimise the wire uplift between them. Normally new bridges on motorways etc provide generous clearances, so I assume there was some reason why they couldn't have made the M60 a bit higher to avoid having to do all this.

I'll wager it's because the OLE in those parts is still fixed tension.

 

[Trackman]

I'll wager it's because the OLE in those parts is still fixed tension.

That was one of my theories.

Anyway, thanks all for your answers