The correct answer is: D. None of these
Load infringing standard moving dimensions (ISMD) are loads that are too large or too heavy to be transported on standard railway cars. They must be transported on special trains that are designed to accommodate their size and weight.
Through trains are trains that travel from one end of the railway network to the other without stopping. Shunting trains are trains that are used to move cars around in a railway yard. Work trains are trains that are used to carry out maintenance or construction work on the railway.
ISMD cannot be transported on through trains, shunting trains, or work trains because they are too large or too heavy. They must be transported on special trains that are designed to accommodate their size and weight.
These trains are typically equipped with cranes or other lifting equipment that can be used to load and unload the ISMD. They may also have special bogies (wheel assemblies) that can support the weight of the ISMD.
The transportation of ISMD is a complex and specialized operation. It is important to use the right type of train and to have the necessary equipment and personnel in place to ensure the safe and efficient movement of these loads.