TÓPICO: Freight Rail and the Trucking Industry in the 20th

Hi,

At what point (decade?) did the trucking industry begin to pose a threat to freight rail? When and how did the railroads respond? Did any railroads attempt to get into the trucking industry, either by having their own fleet of named trucks, or by buying stock in trucking companies? Would the latter have been viewed as a conflict of interest?

Please help.

I didn't find the right solution from the Internet.

References:
cs.trains.com/trn/f/111/t/268968.aspx
Blockchain Technology Advantages

Thanks