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2 aspect headway calculation.
#1
Hi all, I have attempted the question on calculating the headway for 2 aspect signalling with the following parameters and I was wondering if I have the gist correct 

Line speed = 70km/hr - converted into m/s = 19.44m/s 
Sighting Distance = 200m
Overlap =300m 
Distance between 2 signals = 2km = 2000m 
 ·       ¾ loaded super freighter 5x81 class + 58 wagons (see GW-40). 
1 in 60 falling grade

Calculated Braking Distance = BD= Line Speed x2/2a ( acceleration rate of 1.0m/s2 from NIST 012 ( Velocity DMU)
BD = 19.44x2/2(1.0)= 19.44m/s 

Headway Distance = BD+d+OL+Length of train+Sighting Distance = 4119.44 
Headway Time = Headway Distance/V= 4119.44/19.44= 211.9 seconds = 3.53minutes

I get the gist for 3 aspect and 4 aspect but struggle with 2 aspect calculations. Can someone advise if I have done the calculations correctly. 

Thanks, 
Jimmy
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