id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cet-15042		cet-15042		6	.pdf	application/pdf	4212	210	31	Integrating renewable energy into railway systems has been the subject of various studies. However, several challenges still exist in fully integrating renewable energy into railway systems.	cache/cet-15042.pdf	txt/cet-15042.txt