Railperf
Established Member
- Joined
- 30 Oct 2017
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The original class 86 bogies exert too much force on track joints to be used regularly over 100mph. That's why the examples authorised to do 110mph have flexicoil bogies.
Class 67 diesel locos were originally designed for 125mph operation but were initially limited to 110mph to stay within track force limits. The class later achieved a derogation to run at 125mph despite the slightly higher track forces at that speed.
Class 67 diesel locos were originally designed for 125mph operation but were initially limited to 110mph to stay within track force limits. The class later achieved a derogation to run at 125mph despite the slightly higher track forces at that speed.