Up until the Conrail/Amtrak wreck that brought about mandatory drug and alcohol testing -- both random and for cause -- there was a fair amount of drinking (both on the job and while subject to call). Most employees who used alcohol were not intoxicated while on the job. However, there were the small number that could not moderate their drinking. Other employees usually covered for them. There was also frequent marijuana use by a minority of the younger employees. This was the much lower THC marijuana of the 1960's and 1970's. Most of those employees were also functional while on the job.
Mandatory drug and alcohol testing, as well as retirements of older employees from generations who drank regularly, greatly reduced the violation of Rule G. Most employees who might fail a random breathalyzer test will lay off sick (usually when called). That's a different problem, but it avoids permanent dismissal for violation of Rule G. There is no tolerance for alcohol. The breathalyzer is not considered to be sufficiently reliable at .02% or lower, but a test result of .03% or higher will require immediate removal from safety sensitive service, pending a formal investigation, and this applies to officials who supervise Engineers and Trainmen too.
On my first road trip as a Fireman, the Engineer pulled out a pint bottle from his grip, and offered me a swig. I told him that I was not much of a drinker, but he urged me to have a swig. The Brakeman was also paying attention to this, and I could see what was in play. They did not know me and wanted to know whether I was a "snitch" (which I was not), so I wet my whistle from his bottle, passed the test, and was never again pressed to take a drink on the engine.
I was a fairly new employee in 1970, working the afternoon Outside Hostler position at Redondo Junction. One regular duty was to take the passenger engine for the Super Chief-El Capitan down to the main line to Los Angeles Union Passenger Terminal, couple it onto the train and cut in the steam generators. The railroad had begun hiring and there was competition from the aerospace industry. Some days they took any applicant who could fog a mirror. One afternoon I had a brand new hippie-looking Hostler Helper who was obviously a bit high on Marijuana. As we were backing into the depot, I asked him the color of a signal on his side. "It's orange, man," was his reply. Since we did not have an orange aspect, I stopped and crossed over to his side to see that the signal did indeed display yellow. At the depot, he just sat in the Fireman seat until I had cut in the steam. I told him we need to get off the engine and go to eat. He walked front-first out the cab door of the F7 and fell flat, onto he concrete station platform. He just shook his head and got up without so much as a scratch. But he did not last long.
After I was promoted to Engineer but was cut back to Fireman, I worked a "turn", spotting iced reefers at citrus packing houses all the way from San Bernardino to Santa Ana. The Engineer, a 1950 man, told me he was not feeling well and asked me to run the engine. He was looking worse as we progressed. Finally, after we spotted the packing house at Olive, he was shaking and sweating. He said, "Tom, I hate to ask you, but would you go across the street to the liquor store and get me a bottle of potato juice?" I got him his pint of vodka, and, by the time we reached Santa Ana he looked fine. He was a good Engineer. Some, like him, were better with whisky in them. He died at age 50, before the onset of drug and alcohol testing. Drinking did it. He would binge drink and lay off for several days at a time, but never appeared drunk on the job. That day, he had taken a short call for duty and had forgotten that the bottle in his grip was empty.
So, then, the question was: before testing was initiated, how did an employee become discovered in violation of Rule G? Officials were given training in signs and symptoms of substance abuse. If an official said he detected the odor of alcohol on an employee's breath, or erratic behavior, it was not challenged, and the Railway Labor Board would uphold it. At the investigation, the employee would usually say he had one beer while mowing the lawn the afternoon before going to work, or that he had felt a cold coming on and had used Ny-Quil or cough syrup. That would not stop the Company from firing the man, but would leave open a window for possible later reinstatement. I never knew of any official who framed an employee. Personally, I sent a few good railroaders home "sick" and later let them know I could not do it a second time. There was never a second time with them. On another occasion, a Conductor I had worked with came to my office and told me that his Engineer, another man I had worked with and whose wife had died the previous month, was sick (wink) but didn't want to lay off. So I had that crew deadheaded home and the Conductor handled it. Really, most drinking on the railroad where I worked was not a big problem, and a little discretion occasionally by managers made the good employees even more willing to handle any problems themselves. The ones who were unable to control it, we had to dismiss. Same went for new employees during the probation period. Most of the old heads had acquired their drinking habits during long days away from home. Those who hired out already drinking had to go during their 90 day probation.
As information . . . one of the signs and symptoms was overpowering odor of mouthwash on an employee's breath. (Oh, yeah, that'll fool 'em, won't it?)