This addition is intended for fans of unusual traffic and heavy cargo. This addition increased the mass nearly 100 cargoes.
Also in the archive there is a similar add-ons for packs trailers with military cargo pack v.1.7 and railway cargo pack v1.7.

The main modes you can download on the website of the author (Jazzycat).

P. S. In the process of change in mass intensively used information from the Internet and the formula from school physics course - Mass = Volume x Density, and in some cases used fantasy:).

Weight of all locomotives corresponds to the real.
This mod does not claim to full realism.