On Sunday, 15 February 2015 21:36:58 UTC+1, Denis McMahon  wrote:   
   > On Sun, 15 Feb 2015 12:20:08 +0100, bob wrote:   
   >    
   > > Not all crossings in the UK are of this sort, there are also "automatic   
   > > half-barrier" crossings ... they are only used on quiet   
   > > roads with little traffic, and on railway lines with lower speeds.   
   >    
   > AHB in the UK can be installed on lines up to 100 MPH. That's not "lower    
   > speeds".   
      
   100 mph has been exceeded as a top speed for fast trains in routine service   
   for 40 years.  Even the most basic "branch line" DMU built today has a 100 mph   
   top speed.  Everyday there are routine passenger trains in the UK at over 180   
   mph.  In that context,   
    <100 mph counts, in my mind, as "lower speed".   
      
   Robin   
      
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