Re: Train Accident in Blue Mountains

["Derick Wuen" <cullend@webone.com.au>]

-0.52 m/s/s seems slow. I understand old red rattlers were designed for -2
mph/s braking ~ -0.89 m/s/s.

What effect would downhill on a 1 in 60 do to braking rate? Decrease rate by
1-2 %, stopping distances increased 1-2%?

Bill McNiven wrote in message ...

>This is the *first* posting on this subject to contain a relevant number
>(even an estimate).
>
>110 km/h in 900m implies an accelleration of -0.52 m/s/s, from which one
>could extrapolate
>*k*m/hr   m/sec   metres  seconds
>       5    1.39     1.9     2.7
>      10    2.78     7.4     5.4
>      15    4.17    16.7     8.0
>      20    5.56    29.8    10.7
>      25    6.94    46.5    13.4
>      30    8.33    66.9    16.1
>      35    9.72    91.1    18.7
>      40   11.11   119.0    21.4
>      45   12.50   150.6    24.1
>      50   13.89   186.0    26.8
>      60   16.67   267.8    32.1
>      70   19.44   364.5    37.5
>      80   22.22   476.0    42.8
>      90   25.00   602.5    48.2
>     100   27.78   743.8    53.6
>     110   30.56   900.0    58.9
>
>Food for thought!
>
>Bill
>
>