Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 12, 2006 16:09:40 GMT
How do the engineering trains that shed new rails as they travel along a line get the rails curved correctly after depositing them?
|
|
|
|
Post by cdr113 on Dec 12, 2006 23:51:25 GMT
How do the engineering trains that shed new rails as they travel along a line get the rails curved correctly after depositing them? Rail is naturally very 'bendy' (malleable is the correct term, or am I trying to think of that other word I could never remember in school science lessons?!?) when not secured to sleepers and straight sections are easily slewed onto the curve using the cranes on these trains... |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 13, 2006 9:38:15 GMT
Interesting - I would have expected running rails to be much more rigid.
And malleable is a reasonable word to use.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 13, 2006 15:00:18 GMT
only switch rails (bullhead) needs bending this is known as crowing this is to insure the switch rail goes up where he should do for those in the know its called for its planned length
flat bottom rail does not need to be crowed as there is a slighty different arrangement
|
|
|
|
Post by stanmorek on Dec 14, 2006 23:36:29 GMT
Crossing rails are pre-bent (crowed) at the factory and but bullhead rail can be crowed on-site with a special vice. We were replacing an obtuse crossing at Hammersmith Depot once and the new pre-bent rail had been stored nearby. The old rail was taken out during a possession and when we tried to put in the replacement in it wouldn't fit because it'd been bent incorrectly. We had to crow it using the vice with a lot of elbow grease!
Had it been flat bottom it would've be impossible to crow by hand as it's cross section makes it much stiffer.
|
|
