Railroad car with countermeasure structures that minimize the likelihood of deflagration and detonation hazards from gaseous hydrogen fuel storage and supply components thereof

A railroad car that functions as a fuel tender, the railroad car comprising:

• a compartment partially defined by spaced-apart cylinder assemblies, each cylinder assembly including a plurality of cylinders;
• and
• a plurality of different countermeasure structures in the compartment, wherein the different countermeasure structures include:
• a plurality of first countermeasure structures in the compartment, and
• a second countermeasure structure in the compartment, wherein the first and second countermeasure structures are different countermeasure structures, wherein the plurality of different countermeasure structures occupy a percentage that is part of the cubic volume of empty space in the compartment.

A railroad car that functions as a fuel tender, the railroad car comprising:

• a compartment partially defined by spaced-apart first and second cylinder holder racks;
• a first wall filler countermeasure structure mated with the first cylinder holder rack;
• and
• a second wall filler countermeasure structure mated with the second cylinder holder rack.