First off, congrats on the job offer. Don't worry about the probation, if it was on your app then your ok. I'm not 100% sure what the low point to pass a strength test for BNSF is but I wouldn't worry about it. We had 20 people get offers in my class, 12 of which made it, 6 failed drug tests, and 2 turned down the offer at the last minute. The strength test is just to see if you can throw switches and such without difficulty, you'll be fine. They will inform you by email about a start date(which they might have done already) and then confirm it with a second email stating your prescreening went well. I had to call the HR guy to find out because I did not hear anything and my date got close. Suprising that the day after I left him a message asking he sent the confirmation email. When you start class, just take it easy and don't worry about impressing people, just take in every little bit of info you can. I have been taught good things from guys here 30 years and guys here 1 year so take it all in. DON'T act like you know everything because that will alienate you from these guys, I've seen it happen. If you are not sure ask questions, don't make a move if you aren't sure. I don't know what area you are hiring out in but should have between 15 and 19 weeks depending. 19 weeks(which is what I had) was for conductor, hostler, RCO, and suburban services training. You have to have 90% or higher to pass your exams, study and listen in class(which will test your ability to stay awake)and you WILL pass.
WHEN you pass and go into the field, expect to feel as lost as you did on day one. You will develope a comfort zone so to speak when you are training and that comes crashing down when you start for real. Don't worry about it, it will get better with each passing day(speaking from personal experience here).
I am going to assume you are like me being stuck with 75% for brakeman's jobs. This is where you being single really comes into play. Look around for a terminal where they are hurting for people. I say this for this reason. I could hold the brakeman's board at best in Aurora, IL which mainly had me working yard or suburban jobs(75%). I recently transfered to Galesburg, IL. , where right now I can hold a pool turn or conductor extra boards(all 100%). Search it out, find a niche for you (whether it is yard, road) and find a place where you can hold what you want. I wanted the road so that is one reason why I came to Galesburg. Good luck and if you have any other questions feel free to ask. If I can't answer it (which is ALWAYS probable), the people on the forum are very helpful and will be glad to help I'm sure.Let us know how it goes.
'til next time,