# Traction Mechanics

on May 6, 2013

Traction Mechanics is the study of train motion.

The mechanics involve converting overhead electrical /diesel/steam power in rail horsepower to haul a train encountering acceleration, train, grade, curve resistance, and similar braking.

Traction Mechanics involves the concept of

for detailing the motion of a train.

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### Units

The units followed in the day-to-day talk of Railways are different from the conventional MKS systems. The conversion table is given below for a better understanding

 Item Symbol Railway convention MKS Time t Hours 3600 sec Distance D Kilometer 1000 meters Speed V Kmph 1000/3600=0.277m/sec Acceleration fa Kmph/sec 0.277m/sec/sec Weight W Tonne 1000Kg Force F Kgf 9.8 Newton Energy/Work kWh kWh W-sec or N-m or Joules

### Formulas

$V=U+at$                          $D=\frac{V+U}{2}t$                                 $D=Ut+\frac{1}{2}at^{2}$             $V^{2}+U^{2}=2aD$

where D-distance;V-final speed; U-initial speed; a-acceleration

$Force(N-m)&space;=&space;Mass&space;(kg)\times&space;Acceleration&space;(m/sec^{2})$

$Work&space;done&space;(W)=Force(N-m)\times&space;Distance(m)$   where W in N-m or Joules or Watt-sec)

$KE&space;=&space;\frac{1}{2}m\left&space;(&space;V_{1}^{2}-V_{2}^{2}&space;\right&space;)=T\times&space;D$

$PE=mgh$

$Rail&space;Horse&space;Power&space;=&space;\frac{TE\times&space;V}{270}$    where TE is in Kgf, V in Kmph and HP=75*Kgf*m/sec

$OHE&space;Current&space;=&space;\frac{HP\times&space;735.5}{OHE&space;Voltage\times&space;pF\times&space;\eta&space;}$

where  η is efficiency  of Loco

### There is 1 Comment

1. I read your guidance given regarding Group B Exam in Railway which was very practical

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