Locomotive dynamic braking grid package configuration

A resistive grid enclosure for a vehicle having a dynamic braking capability, comprising:

• an enclosure defining an air inlet, an air outlet, and an airflow path through the enclosure from the air inlet to the air outlet;
• a resistive grid disposed within the enclosure for cooling of the resistive grid by air flowing through the airflow path from the air inlet to the air outlet;
• the airflow path being configured so that an inlet airflow is heated by absorbing heat from the resistive grid and directed toward the air outlet forming a heated outlet airflow;
• and
• the enclosure further defining a transfer duct disposed between the air inlet and the air outlet, the transfer duct disposed so as to receive at least a portion of the heated outlet airflow for carrying the heated outlet airflow towards the air inlet for heating the air inlet.

A resistive grid enclosure for a vehicle having a dynamic braking capability, comprising:

• a first enclosure defining a first cavity and an air inlet;
• a second enclosure defining a second cavity, the second cavity having an inlet;
• a first enclosure wall disposed between and separating the first and second cavities, the first enclosure wall defining an opening therein for allowing thermal convection between the first and second cavities;
• a third enclosure defining a grid cavity having a grid cavity outlet;
• a second enclosure wall disposed between and separating the second cavity and the grid cavity;
• a resistive grid disposed in the grid cavity for use in a dynamic braking system;
• and
• a transfer duct disposed between the grid cavity and the first cavity for carrying heated air from the grid cavity to the first cavity to reduce the occurrence of snow or ice at the air inlet of the first enclosure.