New railway service between Iran and China was launched in September 2018.

https://www.railfreight.com/beltandroad/2018/09/05/new-railway-service-iran-china-launched-connecting-inner-mongolia-bam/

This railway service between Iran & China will definitely take more cargoes off the strait of Malacca and Singapore.  Look like the railway business between Iran and China has briskened to prompt the 2 countries to launch another new railway service.

https://www.lowyinstitute.org/publications/understanding-belt-and-road-initiative

Sigh! Malaysia and Singapore will suffer in the future because of the declining cargo volumes in the future.