A modular mobile furnace train apparatus and a process is disclosed. Mobile furnaces may be interconnected in series to form a modular mobile furnace train. Exhaust gas may then flow through mobile furnaces in a furnace train, allowing for more effective heat transfer to payload being heated as well as increasing energy recapture. Volatile gasses emitted by the payload may be combusted. This recapture reduces production of carbon dioxide and reduces the amount of energy required during the firing while the combustion of volatiles reduces exhaust pollutants. A fire line is an area where heat is applied, while a service line is an area where loading, unloading, inspection, and ongoing maintenance may take place. The modular mobile furnace train allows separation of the fire and maintenance which reduces worker exposure to dangerous environments while decreasing operational costs. Furthermore, the modular mobile furnace facility is less costly to build and operate.