I think that section (especially pages 39-42) in Fu Zhongwen's book on jindian 勁點 (energy points), yunjin 運勁 (moving jin), and jinlu 勁路 (jin paths) is one of the best features of the book. I think it's a succinct, intuitive way of understanding and expressing optimal body mechanics, but more importantly how the intent directs movement. As Fu stated, "In using the consciousness to thread to a given position, the consciousness arrives, then the jin arrives--the place where the consciousness is concentrated will then have a resulting sensation." (p. 42)
To my knowledge, neither Dong Yingjie nor Chen Weiming wrote extensively on jinlu. However, you might want to check out Chen Yanlin's writings in Brennan's translation here: https://brennantranslation.wordpress.co ... en-yanlin/
Chen Yanlin used the term several times. In the section on Neutralization (huajin 化勁）it appears twice, where Brennan translates as "the path of his energy" and "the path of your energy." Then in the splendid section on Issuing (fajin 發勁)，it appears in the opening sentence to an excellent paragraph that really summarizes jinlu: "When you begin to learn issuing, you should first know the pathways of energy [勁路]." Later, in the section on Break (jue 撅), it appears in the phrase, 而己亦不能知敵之勁路矣, which Brennan translates: "and you will also be unable to know the path of the opponent’s energy."