"Legal and accounting fees, taxes, etc. are specifically allowed by the Code"
Agree with you on that, for example legal fees are deductible per 20.2053-3(c).
Then when you scroll down, to 20.2053-3(d)(2) the following is stated: "Expenses for selling property of the estate are deductible to the extent permitted by § 20.2053-1 if the sale is necessary in order to pay the decedent's debts, expenses of administration, or taxes, to preserve the estate, or to effect distribution".
But keep in mind the instructions are not all inclusive.
In this case, it appears the travel cost in an ordinary expense allowed under 20.2053-3(d)(2).
I believe the answer here is also yes per 20.2053-3(d)(1) " Expenses necessarily incurred in preserving and distributing the estate, including the cost of storing or maintaining property of the estate." Cost of travel was for preserving and maintaining assets, so why not?