. Railway maintenance engineering, with notes on construction . n orderpromptly to prepare for the next train movement. It is prac- SIGNALS AND INTERLOCKERS 345 ? K Q O <(0 2U ;^ ,-^-^Sr5^.-W»^!f:««]Js-3« gllj n ^j, U» 5 5 ^ ^.HS^ffi^^a o 03 c3 c3 a o 346 RAILWAY MAINTENANCE tically essential wherever it is not possible for the operator toobtain a clear view of the tracks within the interlocking limits. The device consists of a boxlike frame, the front or coverof which is glass, painted to leave transparent the track layoutand to show the relative location of the various switch and signalfu
. Railway maintenance engineering, with notes on construction . n orderpromptly to prepare for the next train movement. It is prac- SIGNALS AND INTERLOCKERS 345 ? K Q O <(0 2U ;^ ,-^-^Sr5^.-W»^!f:««]Js-3« gllj n ^j, U» 5 5 ^ ^.HS^ffi^^a o 03 c3 c3 a o 346 RAILWAY MAINTENANCE tically essential wherever it is not possible for the operator toobtain a clear view of the tracks within the interlocking limits. The device consists of a boxlike frame, the front or coverof which is glass, painted to leave transparent the track layoutand to show the relative location of the various switch and signalfunctions. One or more miniature incandescent Hghts are locatedin a slot or channel behind each track section, the condition ofthe track circuit usually being indicated by whether or not thebulbs are :i Fig. 191.—Model 4, Switch Machine, General Railway Signal Co, The switch and derail functions are operated by switch andlock movements driven by series-wound motors. The Model 4 switch machine of the General Railway SignalCo., shown in Figs. 191 and 192, is designed with all operatingparts within one case. The case, which affords protectionagainst the weather, provides a base plate for the mechanism,being bolted through the tie plate to the head block and thenext tie back. The operating parts consist of the motor A, atrain of spur gears, the main or cam gear Z), the pole changerMj the throw rod J and locking bar F. The motor through the medium of the train of gears drives SIGNALS AND INTERLOCKERS 34
Size: 2108px × 1186px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
