Ensure that all freight containers used for transporting Class
A explosives are weatherproof, allow for secure blocking and
bracing of cargo inside, and can maintain structural integrity
of itself and cargo under an 8 mph impact.
Do  not  use  drop-bottom  railcars
to
transport
freight
containers of Class A explosives.
You  may  transport  Class  A  and  B  explosives  in  trucks  or 
trailers on flatcars if cargo is protected from the weather.
Class A explosives and initiating or priming explosives may 
not be together in the same railcar.
Car certificates are not required for Class C explosives.
Loading Requirements for Flammable Gases
Do not transport flammable gases in a railcar equipped with
any  type  of  open-flame  device,  or  an  internal  combustion 
engine.
Secure cylinders containing compressed gases in an upright
position  to  prevent  their  overturning,  or  load  them  in  a
horizontal position.
Do  not  transport  cylinders
containing
compressed
gases
in
hopper-bottom cars.
Loading Requirements for Poisons
Do not transport poison gas in the same car with any edible
material intended for consumption by humans or animals.
Transport Class A poisons in DOT approved containers or tanks,
and securely block and brace them.
Transport Class A Poisons in carload lots; however, gas-filled
projectiles may be transported in less-than-carload lots. 
Ensure each shipment of Class A Poisons is accompanied at all
times by a qualified escort supplied with equipment to handle
leaks  and  other  packaging  failures  which  could  result  in
escape of the gas.
When transporting Class A Poisons in a tank, securely mount on
a railcar especially provided for it or on a gondola car 
prepared with substantial wooden frames and blocks.
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TR1030