NEW DELHI, Nov 29 (Reuters) - Moscow has sent India a list of more than 500 products for potential delivery including parts for cars, aircraft and trains, four sources familiar with the matter said, as sanctions squeeze Russia's ability to keep vital industries running.The list, a version of which has been seen by Reuters in New Delhi, is provisional and it is unclear how many of the items will eventually be exported and in what quantity, but an Indian government source said the request was unusual in its scope.An industry source in Moscow, who declined to be named because of the sensitivity of the issue, said Russia's Ministry of Industry and Trade asked large companies to supply lists of raw materials and equipment they needed.Russian metals producers like nickel and palladium giant Nornickel (GMKN.MM) have said Western sanctions and self-sanctioning by some suppliers have made it difficult for industrial companies to obtain imported equipment, spare parts, materials and technologies in 2022, posing a challenge to their development programmes.But some Indian companies are reluctant to export to Russia over fears of being sanctioned by the West, the lack of clarity over payments and challenges to securing insurance."