Aftertreatment system for locomotive

An apparatus for aftertreatment of exhaust flow from an engine of a locomotive, comprising:

• a housing having an elongate length and a height that is relatively smaller than the elongate length;
• a mixing tube configured to receive the exhaust flow of the engine, wherein the mixing tube is positioned within the housing and extends longitudinally along at least a portion of the elongate length of the housing;
• a first plurality of treatment units in fluid communication with the exhaust flow from the mixing tube, wherein catalysts of the first plurality of treatment units are configured to treat the exhaust flow;
• and
• a door forming part of a roof of the locomotive, wherein the door is openable to provide direct access to at least some of the first plurality of treatment units;
• and
• wherein the apparatus is configured to be received in a recess of the locomotive above the engine and the apparatus includes a recess therein configured to accommodate a height profile of the engine, and wherein the apparatus has a maximum height of less than 700 mm.

An apparatus for aftertreatment of exhaust flow from an engine of a locomotive, comprising:

• a housing having an elongate length and a height that is relatively smaller than the elongate length;
• a mixing tube configured to receive the exhaust flow of the engine, wherein the mixing tube is positioned within the housing and extends longitudinally along at least a portion of the elongate length of the housing;
• a first plurality of treatment units in fluid communication with the exhaust flow from the mixing tube, wherein catalysts of the first plurality of treatment units are configured to treat the exhaust flow;
• and
• a door forming part of a roof of the locomotive, wherein the door is openable to provide direct access to at least some of the first plurality of treatment units;
• and
• wherein the door includes a plurality of baffles to direct the exhaust flow toward an outlet of the apparatus.

A locomotive comprising:

• an engine;
• exhaust ducting coupled to the engine and configured to configured to receive an exhaust flow from the engine;
• and
• an apparatus for aftertreatment of the exhaust flow from the engine, wherein the apparatus forms part of a roof of the locomotive, the apparatus comprising:
• a mixing tube configured to receive the exhaust flow from the exhaust ducting;
• a pair of plenums arranged on opposite sides of the mixing tube, the pair of plenums including a first plenum and a second plenum;
• a first plurality of treatment units in the first plenum in fluid communication with the exhaust flow from the mixing tube, wherein catalysts of the first plurality of treatment units are configured to treat the exhaust flow;
• a first door forming part of the roof of the locomotive and sealing the first plenum, wherein the first door is removeable from the apparatus to provide access to at least some of the first plurality of treatment units for removal and replacement;
• a second plurality of treatment units in the second plenum in fluid communication with the exhaust flow from the mixing tube, wherein catalysts of the second plurality of treatment units are configured to treat the exhaust flow;
• and
• a second door forming part of the roof of the locomotive and sealing the second plenum, wherein the second door is removeable from the apparatus to provide access to at least some of the second plurality of treatment units for removal and replacement.