I want to know the answer to the following question:
What is a major factor whn it comes to electrification?
All the background I'm provided with is that "In theory, these trains could enjoy dramatic savings through electrification, but it can be too costly to extend electrification to isolated areas, and unless an entire network is electrified, companies often find that they need to continue use of diesel trains even if sections are electrified.". Is that enough to answer the question?
Answer: no