>>東海道本線の特急「つばめ」「はと」
>>1960年6月より「つばめ」の車両を151系電車に置き換えて
>>2往復（1往復は神戸駅発着）に増発され、
>>同時にスピードアップして東京駅 - 大阪駅間所要6時間30分となった。

もしかすると「つばめ」ではなく「はと」の方だったかもしれない。
いずれにせよ、それはAkizuki-Nakanoが日本学士院紀要に載る前だから
1954年のことで、蒸気機関車の時代のこと。
名古屋で機関車を取り換えたのかもしれない。
Akizuki, Yasuo; Nakano, Shigeo
Note on Kodaira-Spencer's proof of Lefschetz theorems.
Proc. Japan Acad. 30 (1954), 266–272.
M(D) denotes the faisceau of meromorphic
n-forms on an algebraic variety
X which are (locally) multiples of the divisor D. Here n=dim X.
Kodaira obtained sufficient conditions on M(D) in order that
H^1(X,M(D))=0. This paper obtains similar conditions
(not identical with those of Kodaira), showing that
H^{p,q}(X,M{D})=0 if p+q>n
when there exists a form of type (1–1) dual to D
whose coefficients form a positive definite Hermitian matrix.
The method depends on a new property of harmonic integrals
on a complex line bundle. Several known results in the related
field of algebraic geometry are quickly deduced from this result,
e.g. Lefschetz's theorem when D is a generic section of
X, and also the theorem that a complex line bundle over an algebraic variety
is equivalent to a divisor class.
Reviewed by W. V. D. Hodge