Ways of Entering New Vegas

Those are the only two entrances, but there are several ways to get past the securitron's credit check:

• If you have 2000 caps, you pass the credit check and are allowed in. You don't lose the caps (that's what the casinos are for)- the robot just wants to know you're rich enough.
• With 80 Science, you can reprogram the securitron to let you in.
• Ralph will sell a fake passport if you have 50 Speech for 500 caps, or 375 with 50 barter
• If you ask for a way to enter the Strip as your favour from The King, Ralph will give you the passport for free and without the check.
• If you can somehow beat five securitrons, you can fight your way in. The gate is locked but the key can be looted from the securitron who first talks to you. This does give a lot of Strip infamy and turns the other securitrons inside hostile.

The monorail can be used with any positive NCR reputation, or if you disguise yourself as an NCR soldier.