I'm not saying that a locomotive couldn't be made into a hybrid, with some serious batteries (or capacitors, same thing basically) and controller. It should be pretty obvious that is all that is missing to make it a hybrid. But the typical diesel-electric is not a hybrid. Saying it uses a "hybrid driveline" only confuses the issue, something GM would do
From your own link:
Clarke estimated that there are 7,000 diesel locomotives in branch operations in North America.
"We plan to turn some into hybrids," he said.