“CIVIL ENGINEERING FEATURES OP TYNE AND WEAR METRO”

Discussion

Reported by Mr. D.H. Mitchell, C.E.G.B. (Berkeley Nuclear Laboratories)

In reply to an unidentified &peaker Mr* Bouard confirmed that overhead cables would be used in the tunnels* 5hey had considered the use of a three rail system in the tunnels, with overhead cables elsewhere, but there were a number of factors whioh ruled against it, particularly safety aspects* They had b. en able to put the overhead

system in with only a tn©rginal increase iri tunnel diameter since the flat roof design of the car meant there was considerable headroom in which to place the pantograph and cable*

Mr« L»F« McCalvey (international Research & Developerant Co.Ltd.,) asked what were the advantages of the inverted U shaped tunnel used in